Diana creeps over to the west side of the room to listen where a hallway trails into darkness. She motions back to Presto and Eric to "shush" and mimes that people are sleeping in that direction. 

Presto and Eric advance to the east side, where the hallway maintains its eerie green light. They motion to Diana that it's clear. 

Diana searches around the sanctuary and altar, while Eric dips in and around the pews.  

Presto takes a small alarm clock out of his hat and places it gently against the frame of the hallway leading to the sleeping sounds.  

An ominous library opens before them. Shelves, tables, boxes and sacks of all kinds and in all manners of condition line the walls and pepper the room. A square, sturdy table dominates the center of the room, inundated with parchments, notes, and various bottles and ingredients.    

Presto and Eric freeze. They can just make out someone chanting loudly, nearly indiscernable, in a roughly-carved space broken through the library's south wall. 

Presto visibly gulps. He takes a large swath of the papers and stuffs them into his hat, where they disappear, and then hurries to catch up to Diana and Eric.

Below, at the end of a winding cave path, the bottom of the cavern displays a giant circle made of runes. Outside of it, a robed figure (human, older with oily hair and gaunt, grey skin) chants loudly, and two more cultists- one human, one elf- stand inside, swaying to the monotonous rythym, entranced.    

The cultists within the circle scream, collapsing to the floor, with dark shadows spilling upward from their eyes, mouths, and pores, like steam from a scathing pot. They coalesce into newly-created Shadow Demons, hovering over their former bodies, hissing.